Question

c is in the opposite of A so angle c should be = angle a (vertically opposite angles
but why in the book it is written angle a = angle d (see the Q mark)
explain it!!
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Answer 1

hey trisha see clearly
angle c b and a are im st. line so thry form linear pair.

Answer 2

angle a, b and c lie on a straight line, Therefore c can't be the opposite angle of a but d is the opposite angel of a.
Plz check the figure carefully, as it looks like that but c is the opposite angle of f, and not a.
IN the book it's written correct.
Hope you have understood my answer...
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